Your Essential Tool for GY6 50/125/150CC Repair. Lightweight Magneto Flywheel Puller Tool. 24mm Hand Thread: Designed for the majority of GY6 50 4 Stroke Scooters, Mopeds, and ATVs. 27mm Hand Thread: Fits most GY6 125 and 150cc Scooters, along with other 125cc Motorcycles.